Mitsubishi Outlander (2003+). Manual — part 554
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-31
INSPECTION PROCEDURE 2: The air conditioner does not work at all. <4G63>
CIRCUIT OPERATION
If cool air is not distributed when the A/C switch is on,
A/C compressor relay system may be defective.
Possible causes
•
Improper amount of refrigerant
•
Malfunction of the A/C pressure sensor
•
Malfunction of the A/C compressor relay
•
Malfunction of the magnetic clutch
•
Malfunction of the A/C refrigerant temperature
switch
•
Damaged the wiring harness or connectors
•
Malfunction of the automatic air conditioner
control panel (A/C-ECU)
20
10
14
4
(MU801585)
11
1
13
12
2 3
17
7
1516
5 6
1819
8 9
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
A/C
COMPRESSOR
RELAY
A/C
COMPRESSOR
ASSEMBLY
A/C
REFRIGERANT
TEMPERATURE
SWITCH
MAGNETIC
CLUTCH
A/C-ECU
A/C PRESSURE
SENSOR
IGNITION
SWITCH (IG2)
ENGINE-ECU
BATTERY
RELAY
BOX
A/C Compressor Circuit
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-32
DIAGNOSIS
Step 1. Use the MUT-II/III to confirm a diagnosis
code.
On completion, check that the diagnosis code is not
reset.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to diagnosis code chart
Step 2. Check the blower operation.
(1) Turn the ignition switch to the ON position.
(2) Blower knob: Other than OFF
(3) Check that the air comes out of the blower.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Refer to Inspection Procedure 4 "The
blower does not work."
STEP 3. Check the defogger and outside/inside
air selection damper control motor operation.
Q: Do the defogger and outside/inside air selection
damper control motor work normally?
YES :
Go to Step 4.
NO :
Refer to Inspection procedure 10
"Malfunction of the A/C-ECU power supply
system
STEP 4. Check the A/C compressor.
Check the A/C compressor for compressor oil leaks.
Q: Is the check result satisfactory?
YES :
Go to Step 5.
NO :
Replace the A/C compressor or the
expansion valve.
STEP 5. Measure the voltage at B-27 A/C
compressor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Disconnect engine-ECU connector C-134 and
earth terminal 8.
(4) Voltage between terminal 1 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 17.
NO :
Go to Step 6.
STEP 6. Check the A/C compressor relay
continuity.
Refer to GROUP 55A - On vehicle service, power
relay
Q: Is the A/C compressor relay in good condition?
YES :
Go to Step 7.
NO :
Replace the A/C compressor relay.
AC301648
Connector: B-27
Harness side
1
B-27(B)
AB
AC301397
Connector: C-134
AO
Harness side
22
9
14
15
2 1
3
16
1918
5 4
17
6
21
7
20
8
25
12
10
23
11
24
26
13
JAE-E
AC301541BU
Connector B-27
(Harness side)
1
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-33
STEP 7. Measure the voltage at B-18X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay block
side.
(2) Turn the ignition switch to the "ON" position.
(3) Voltage between terminal 3 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Go to Step 8.
STEP 8. Connector check: B-18X A/C
compressor relay connector.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the connector.
STEP 9. Check the wiring harness between B-18X
A/C compressor relay connector terminal No.3
and the ignition switch (IG2).
AC301483AG
Front of
vehicle
Relay box side
1
3
2
4
B-18X
-
Connector: B-18X
AC301541BV
Connector B-18X
(Relay box side)
Front of
vehicle
1
3
2
4
AC301483AG
Front of
vehicle
Relay box side
1
3
2
4
B-18X
-
Connector: B-18X
AC301483AG
Front of
vehicle
Relay box side
1
3
2
4
B-18X
-
Connector: B-18X
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-34
NOTE:
Prior to the wiring harness inspection, check junction
block connectors C-203, C-202 and intermediate
connector C-106, and repair if necessary.
•
Check the A/C compressor relay power supply
line for open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
STEP 10. Measure the voltage at B-18X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay block
side.
(2) Voltage between terminal 4 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Go to Step 11.
AC301397
Connector: C-106
AG
C-106(GR)
13
3
7
16
19
15
14
18
17
12
6
4
8
1
9
11
10
5
2
AC210475
Connectors: C-202, C-203
AG
Junction block (Front view)
C-202
C-203
Harness side
C-203
C-202
4
6 5
3
2
1
10
1
6
14
5
12
13
4
11
7
2
3
8
9
AC301483AG
Front of
vehicle
Relay box side
1
3
2
4
B-18X
-
Connector: B-18X
AC301541BW
Connector B-18X
(Relay box side)
Front of
vehicle
1
3
2
4
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